Preparation and characterization of Fe,Co,Si-pillared montmorillonites with aminosilanes as silicon pillars precursor

AbstractCatalytic properties of Cu-doped alumina-pillared montmorillonite samples have been tested in the liquid phase oxidation of toluene, o-, m-, and p-xylene with hydrogen peroxide. The results show that the clay samples possess significant activity for both the oxidation of methyl groups and hydroxylation of the aromatic ring. Physicochemical characterization of the catalysts using XRD, BET, ESR and ICP-AES techniques show that they are porous materials with Cu species located in the interlayer, present either as isolated Cu2+ ions anchored at alumina pillars or as patches of amorphous CuO. The dependence of the overall yields on the amount of Cu dopant is discussed and explained in terms of the catalyst structural properties.

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Hydrothermal Synthesis and Characterization of Zr-Pillared Montmorillonite for MTO

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.2366 ◽

2012 ◽

Vol 512-515 ◽

pp. 2366-2371

Author(s):

Shu Fang Chen ◽

Ding Tong Zhong ◽

Zhao Ni Wei ◽

Cheng Lin

Keyword(s):

Zirconium Oxychloride ◽

Micropore Volume ◽

Raw Material ◽

Bet Surface Area ◽

Synthesis And Characterization ◽

Catalytic Activities ◽

Mto Reaction ◽

Pillared Montmorillonites ◽

Reaction Result

Zr-pillared Montmorillonites (Zr-PILM) were prepared by the hydrothermal method with montmorillonite as raw material and zirconium oxychloride as Zr source of pillaring agent. The properties of the samples were characterized by XRD,BET, SEM, TEM, XPS. Effects of the synthesizing conditions on the structures of Zr-PILM were investigated. The results indicate that Zr-PILM retains complete layered and sheeting structure, and its BET surface area and micropore volume increases greatly. ZrO2 exists in Zr - PILM layers.The catalytic reaction result of MTO shows that Zr-PILM has high catalytic activities for MTO reaction.

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Modeling and characterization of tunable photonic crystal waveguides based on two-dimensional periodic arrays of silicon pillars

10.1117/12.869833 ◽

2010 ◽

Author(s):

Haider Butt ◽

Qing Dai ◽

Timothy D. Wilkinson ◽

Gehan A. J. Amaratunga

Keyword(s):

Photonic Crystal ◽

Two Dimensional ◽

Photonic Crystal Waveguides ◽

Periodic Arrays ◽

Silicon Pillars

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Preparation and Characterization of Chitosan/Hdroxy-Aluminium Pillared Montmorillonite Nanocomposites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.825 ◽

2007 ◽

Vol 334-335 ◽

pp. 825-828 ◽

Cited By ~ 1

Author(s):

Wei Tan ◽

Yi He Zhang ◽

Yau Shan Szeto ◽

Li Bing Liao

Keyword(s):

Metal Ions ◽

Chitosan Solution ◽

Exchange Capacity ◽

X Ray Diffraction ◽

X Ray ◽

Pillared Montmorillonite ◽

Pillared Montmorillonites ◽

Cationic Exchange ◽

Montmorillonite Nanocomposites

It was shown that chitosan and hydroxy-aluminum pillared montmorillonites were excellent materials for the removal of dyes and metal ions from effluent of dying and finishing. Chitosan/ hydroxy-aluminum pillared montmorillonite nanocomposites are expected to play a multiplex role in the treating process. In this study, the nanocomposite was prepared by incorporating hydroxy-aluminum pillared montmorillonite into chitosan solution that diluted acetic acid was used as solvent for dissolving the chitosan. The ratio of chitosan to the cationic exchange capacity of the montmorillonite was about 1:1, 2:1, 3:1, 4:1 and 6:1, respectively. The nanocomposites were characterized by XRD (X-ray diffraction), SEM (Scanning Electron Microscopy). The experimental results indicated that the presence of hydroxy-aluminum cation was in favor of the chitosan intercalation and the interlayers of MMT was intercalated with the bilayers of chitosan sheets. and they can be used in absorption of organic and metal ions for dying and finishing effluent.

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